Double-compression reciprocating implement.



S. D. SIBLEY.

DOUBLE COMPRESSION, RECIPROGATING IMPLEMENT.

APPLIUATION FILED MAY 8, 1912.

1,072,367, Patented Sept. 2, 1913.

2 BHEETBSHEET 1.

COLUMBIA I'LANOQRAPH C0..WA:; C.

S. D. SIBLEY. DOUBLE COMPRESSION, REGIPROGATING IMPLEMENT.

APPLICATION FILED MAY 8, 1912.

Patented Sept. 2, 1913.

2 SHEETS-SHEET Z.

l vi/tmaoow UNTE STATES PATENT OFFTCE.

SAMUEL D. SIBLEY, OF SYRACUSE, NEW YORK, ASSIGNOR TO THE PNEUMELECTRIC MACHINE COMPANY, OF SYRACUSE, NEW YORK, A CORPORATION OF NEW YORK.

DOUBLE-COMPRESSION REOIPROCATING IMPLEMENT.

To all whom it may concern Be it known that I, SAMUEL D. SIBLEY, a citizen of the United States, residing at Syracuse, in the county of Onondaga and State of New York, have invented certain new and useful. Improvements in Double- Compression Reciprocating Implements, of which the following is a specification.

The present invention relates to such pressure driven reciprocating implement that have two pistons, one driven by the other, and the object of my invention is to produce an implement of this kind that is simple in c mstruction, has a short compression stroke and variable striking positions. For this reason I provide a cylinder of two diameters, the most distinguishing feature of which is that it has no moving valves.

In the accompanying drawings :--lfiigure 1 is a longitudinal section of the working cylinder, with the parts shown in starting position; Fig. 2, a cross section on line 2-2 of Fig. 1; Figs. 3 and 4t, longitudinal sections of the cylinder, with the pistons in section and representing different stages of the stroke to what is shown in Fig. 1; Fig. 5 a cross section on line 5-5 of Fig. 1.

A, B, G, D represent the working cylinder or housing for pistons, compartment A, 1' being of larger diameter than compartment C, D. In the following A, B will he referred to as the large compartment and C, D as the small compartment. A is the rear end and B the forward end of the large compartment and C is the rear end and D the forward end of the smaller compartment of the working cylinder.

E is the driving piston for A B with a contracted portion extending into, and of the same diameter as C D; through the motor driven piston rod H the driving piston receives its regular back and forth movement from a motor not shown. Packings T T T and T are suitably placed on the driving piston to prevent leakage. The length of compartment A B is somewhat greater than the length of the stroke of the driving piston E in order to leave some play at the two extremities of the stroke between the piston and the ends of the compartment;

F is the driven piston, with the tool rod G to which a bit (not shown) is attached at the forward end. In the side wall of the working cylinder is an air passage P, open- Specification of Letters Patent.

Application filed May 8, 1912.

Patented Sept. 2, 1913. Serial No. 695,902.

ing into the forward end D of com mrtment C D, through port I, a shortdistanee from the end wall of compartment C D, so that when piston F strikes said end wall, it will close port I. The other port 1; of passage P opens into the rear end I) of said conapartment, and is so located that it. will open into end B of compartment A B through passage .M,only a moment after pi ton It has started on its forward movement. The starting position is represented in Fig. 1 and shows the by-pass T1 in the piston lG registering with port U, so that the compartment end B comnmnicates with the open air. At the same time compartment end A connects with end (l throi'lgh passages N and X in piston 1'] and through port .l made as an annular grotwe in the side of the working cylinder. Near the end of the stroke of piston 1 eompartn'lent end A communicates with compartment end C through the same passages N, X registering with port K, cut in the side of the working cylinder. This is shown in Fig. 3. A step nearer the end of the stroke port Q, cut in piston I), registers with port P, connecting ends ll and (l of the two cylinder compartments through passage 1 and port I. At the end of the stroke, the port ti and the bypass it, which are both situated .in the driving piston .E, at its large end, registers with the port U and the by-pass V, cut in the side of the working cylinder, the port K is now closed by the piston 1).

Proceeding now to describe the operation of the tool we will consider seven different positions of the piston E as it makes a double stroke, moving with a uniform speed, actuated by a motor. In the first position. as represented in Fig. 1, piston F is standing just back of port 1 having a cushion of air in front of it. Similarly piston IE stands back a short distance from the rear end of compartment A B. As port U now is open, there will be atmospheric pressure at end B; and practically the same pressure will be found at A, O and D, as A and C are cannmunicating through N X J. In passing from the first to the second position ports J and U are closed and compartment ends B and D communicate for a moment as port P registers with by-pass M. Second position, when the large part B of the driving piston has :trived to about the middle of compartment A 13, all the passages are now shutofi, air is being compressed in ends B and C of the compartments and rarefaction is taking place at end A of compartment A B. This condition continues until the driving piston E arrives in its third position, see Fig. 3, when the orifices of passages X register with port K allowing the air compressed at C in the compartment C D to pass over to A of compartment A B through passages X N. A moment later, in the fourth position, the port P opens through port Q; so that the air compressed in end B of compartment A B is let through passage P and port P opens into end D of compartment C D. Piston F will then be retracted, partly actuated by compressed air in front'of it and partly by suction behind it. As soon as piston F has passed the forward opening of port K it will close said port, leaving an air cushion between the two pistons. At the end of the forward stroke of piston E, position 5, atmospheric air is let into end A of compartment A B through ports and passages S V R U, in order to compensate for leakage; port K is closed but port P remains open. On the return stroke of the driving piston all the ports are closed so that air will be compressed at end A and rarefied at end B of compartment A B. Piston F continues its retracting movement following piston E until, in position 6, port P opens through by-pass M into end B of compartment A B equalizing the pressure at B and D to a little below atmospheric. In the next instant, position 7, port J is open, and the air compressed at end A of compartment A B rushes through passages N X into end C of compartment C D, reversing the movement of piston F, forcing it forward, the driving piston E going back a little farther until it gets into its starting position, whereupon the operation is repeated. Should piston F on its forward stroke run past port P no air can come into end D of compartment C D, when the driving piston next returns to position 5. As a consequence piston F will not then be retracted. The whole machine will therefore have to be fed forward, preparatory to the next stroke of the piston P so as to uncover port P when the operation can again be repeated.

In the above description, it has been assumed that air was used as a pressure medium. I do not, however, limit myself to the use of atmospheric air, as any other pressure medium may equally well do the work.

In the claims chambers A and C are referred to as the rear ends and chambers B and D as the forward ends of the large and small compartment of the cylinder respectively.

I claim 1. A double-compression reciprocating implement comprising a working cylinder having two communicating compartments of different diameter, in combination with a moto "-driven piston working in both of said compartments and a tool-carrying piston working in the small compartment only, said tool-carrying piston receiving its impulse through a pressure medium actuated by said motor-driven piston, said working cylinder and said motor-driven piston being provided with means of communication for conducting the pressure medium, at successive predetermined parts of the stroke of the motor-driven piston, from the rear end of the small compartment to the rear end of the large compartment; from the forward end of the large compartment to the forward end of the small compartment; from the rear end of the large compartment to the outer side of the cylinder; from the rear end of the large compartment to the rear end of the small compartment; and from the front end of the large compartment to the outside of the cylinder, respectively, for the purpose of giving a reciprocating movement to the tool-carrying piston.

2. A double-compression reciprocating implement comprising a working cylinder having two communicating compartments of different diameter, in combination with a motor-driven piston working in both of said compartments and a tool-carrying piston working in the small compartment only, said tool ca-rrying piston receiving its impulse through a pressure medium actuated by said motor-driven piston, a pressure fluid conduit in said working cylinder openmg with its forward end near the front wall of the small compartment and the rear end of said conduit opening near the rear end thereof; a port in said motor-driven piston connecting the rear opening of said conduit with the forward end of the large compartment at a certain part of the stroke, and an.- other port in the same piston making similar connection at a different part of the stroke; a second pressure fluid conduit in said motor-driven piston with one opening at the rear end, another opening around its periphery near the forward end of said motor driven piston; a port in said working cylinder connecting said forward opening of the second conduit with the rear end' of the small compartment at a certain part ofthe stroke, and another port in the cylinder making similar connection at another part of the stroke; a third pressure fluid conduit in said working cylinder with its outer end communicating with a pressure fluid supply, and the inner end opening near the rear end of the small compartment; a port in saidmotor-driven piston connecting the inner opening of the third conduit with the forward end of the large compartment at one part of the stroke, and another port in the same piston connecting the inner opening of the third conduit with the rear end of the large compartment at another part of the stroke of said l'i'iotor-driven piston.

8. A double compression reciprocating implement comprising a Working cylinder having one compartment of relatively large diameter and communicating therewith and in front thereof, a compartment of relatively small diameter; in combination with a toolcarrying piston working in and being of the same diameter as the small compartment; its piston rod extending through the wall at the forward end of the small compartment; a motor-driven piston, With its acti'lating piston rod extending through the wall at the rear end of the large compartment, the rear end of said motor-driven piston being oil the same diameter as the large compartment and the forward end thereof being of the same diameter as the forward compartment; pressure fluid conduits and ports in the working cylinder and pressure fluid conduits and ports in the motor-driven piston distributed; one of said ports being situated at each end of said small compartment with one of said conduits connecting them, another of the ports located near the middle of the small compartment, one of said ports being situated at the rear of the forward end of said motor driven piston, a plurality of said condu its running transversely through its forward end and another of said conduits opening at the rear end oi the same piston, and connecting with said transverse conduits, as well as an annular port near the rear end of the small chamber, whereby transmission of the pressure medium from one of said compartments to the other in both directions is accomplished; another of said ports at the rear end, one near the forward end of said motor driven piston, one of said conduits near the front end of said large compartment and a port near the rear end of said small compartment whereby transmission from the large compartment to the pressure fluid supply in both directions, all for the purpose of giving impulse in both directions to the tool-carrying pistons.

The foregoing specification signed at Syracuse, New York, this 29th day of March, 1912.

SAMUEL D. SIBLEY. in presence of CHAS. R. S'rnvnR, ELMER C. lVARn.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). C. 

